1. C ++
Inheritance

2. Inheritance A derived class is an addition to a base class.
The attributes and functions of the base class are available in the derived class,
Almost
private
protected
public

3. A base class X and a derived class Y

4. TTYP –derived class for book
class catalog_item {
char* title;
char* catalog_number;
public:
catalog_item(){title = new char[MAX];
catalog_number = new char[MAX];}
void addtitle (char* newtitle);
void addcatnum(char* new catnum);
void display(); };
TTYP1 – write declaration of attributes and functions
TTYP2 – write definition of addbook

5. Library Object model

6. Storing base and derived instances
A pointer to a base type can point to instances of derived classes
Virtual functions will figure “right” function to apply
type casting can let the compiler know when you know that the type is really something else.

7. TTYP3 - addbook Write an addbook function for the library class
Assume that library has an array of pointers to catalog-items
catalog-item *itemlist[MAX];

8. Redefining functions Must have the same return type Virtual functions
puts indirection in object space

9. TTYP4
Write a display function for book

10. TTYP5
Write a virtual display function for cat-item

11. TTYP6
Write a display function for library